package cn.edu.scau.cmi.mazhuanglong.esercise5;

public class Circle {

	double radius, area;

	Circle() {
	}

	Circle(double r) {
		radius = r;
	}

	void setRadius(double r) {
		if (r > 0) {
			radius = r;
		}
	}

	double getRadius() {
		return radius;
	}

	double getArea() {
		area = 3.14 * radius * radius;
		return area;
	}
}
